Zeno of Citium (ca. 334/333–262/261 BCE), the founder of the Stoic school in Athens, substantially shaped the thought of subsequent generations of Hellenistic philosophers, both his followers and his opponents. Since he is one of the most renowned Stoic philosophers, alongside Chrysippus, a new edition of his numerous fragments is an indispensable tool for studying in depth the origins of Stoicism, including Zeno’s legacy in significant philosophers of the imperial age, such as Seneca and Epictetus.This long-awaited new edition of Zeno’s fragments gathers all the testimonies that Hans von Arnim had already collected about 120 years ago, adds a significant number of new testimonies (based on a reassessment of Greek and Latin literature, new insights into the Herculaneum and Graeco-Egyptian papyri, as well as on Arabic and Syriac sources) and restructures their presentation by thematic and philosophical criteria. The sections on the Life and the Works of Zeno provide a detailed overview of the information dealing with his life, as well as with his vast literary output – in spite of the unfortunate loss of nearly all his work. Similarly, the reconstruction of Zeno’s philosophical doctrine is enhanced — within the tripartition of philosophy into logic, physics, and ethics — by the granularity of each section, divided into headings and sub-headings that identify single topics of philosophy.In addition, this is the first collection of Stoic fragments to assemble the Arabic tradition of Zeno’s sayings, along with those transmitted in Greek and Latin sources. A rich apparatus of commentary notes accompanies the fragments and guides the reader through the current scholarly debates. This groundbreaking volume of Zeno’s fragments is intended as the definitive reference-work for both experts in ancient philosophy and non-experts. Its principal aim is to provide an easy and authoritative access to a revolutionary figure of Antiquity: a man at the crossroads of Phoenicia and Greece that shaped Western philosophy with the novelty of his doctrines.